12 soil orders

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Across
  1. 9. acid soils characterized by a subsurface accumulation of humus that is complexed with Al and Fe
  2. 10. soils of recent origin
  3. 11. soils of very cold climates that contain permafrost within two meters of the surface
  4. 12. strongly leached, acid forest soils with relatively low native fertility
Down
  1. 1. the soils of grassland ecosystems
  2. 2. soils that have formed in volcanic ash or other volcanic ejecta
  3. 3. very highly weathered soils that are found primarily in the intertropical regions of the world
  4. 4. soils that are composed mainly of organic materials
  5. 5. soils that exhibit minimal horizon development
  6. 6. moderately leached soils that have relatively high native fertility
  7. 7. CaCO3-containing soils of arid regions that exhibit subsurface horizon development
  8. 8. clay-rich soils that shrink and swell with changes in moisture content